Drilling fluid fluorescence automatic detection equipment and application method

Abstract

The present application relates to oil and gas reservoir oiliness detection technical field, a kind of drilling fluid fluorescence automatic detection equipment, comprising: sample pretreatment system, sample cooling system and sample fluorescence detection system, sample pretreatment system includes filter cover, quantitative diaphragm pump and rock debris grinder, for quantitative collection drilling fluid and rock debris, and the rock debris is ground;Sample cooling system includes the lower box and refrigerator, for cooling treatment to sample;Sample fluorescence detection system includes LED ultraviolet light excitation component, sample cell, fluorescence reflection component, detector, for sample fluorescence detection, sample into sample cell from cooling component, obtains sample fluorescence reflection to detector after LED ultraviolet light irradiation, forms fluorescence intensity signal and fluorescence image.The present application has the characteristics of quantitative extraction sample, high-intensity ultraviolet light source irradiation, automatic continuous fluorescence detection, improves the effectiveness and accuracy of sample fluorescence analysis.

Description

Technical Field

[0001] This invention relates to the field of oil and gas reservoir oil content detection technology, and more specifically, to an automatic drilling fluid fluorescence detection device and its application method. Background Technology

[0002] During oilfield drilling, engineers need to analyze the hydrocarbon properties characterized by the drilling fluid returned from the formation, including oil-bearing analysis of cuttings and drilling fluid. Based on the common fluorescent properties of hydrocarbon components, oilfields both domestically and internationally widely employ fluorescence analysis techniques to evaluate reservoir oil-bearing potential. Examples include qualitative direct and drop fluorescence analysis of cuttings, core samples, and rock cores, as well as quantitative fluorescence analysis using spectrometers. However, current literature lacks continuous and quantitative fluorescence analysis equipment and methods for drilling fluids and the cuttings they carry. Furthermore, existing oil and gas fluorescence analysis equipment used in drilling sites suffers from long analysis cycles for single sample points, inability to perform real-time continuous analysis, and significant human error. Overall, these limitations restrict the effectiveness and accuracy of fluorescence analysis technology in oil and gas field development.

[0003] Chinese patent CN111665198A discloses a portable fluorescence fiber optic spectrometer, which consists of an excitation light source, a filter, a Y-type fluorescence fiber optic probe, a detection and excitation device, and the spectrometer body. This achieves a portable and integrated device, enabling rapid and reliable measurements even in complex background light environments, without requiring optical path configuration or environmental settings. Chinese patent CN108897126A discloses a fluorescence imaging system, including a point light source array module, an optical lens system, a filter group, a microscope objective, a stage, an imaging lens, a photodetector, and a synchronous control system. This system offers advantages such as fast imaging speed, high light source energy utilization, small system size, and low cost. Chinese patent CN209416927U discloses a multifunctional digital fluorescence imaging detector, including a housing and an external control system. The housing is equipped with a light source and a three-dimensional moving stage, a clamping robotic arm, and a titration robotic arm located below the imaging device. The external control system controls the light source and other mechanical components by sending signals, enabling all-round observation and static image preservation of samples such as rock cuttings, wall cores, and rock cores under different light source conditions, and efficiently completing the lithology and oil and gas detection of the samples.

[0004] The aforementioned fluorescence analysis devices significantly improve portability, light source efficiency, fluorescence signal sensitivity, and automation, solving corresponding practical problems. However, these devices suffer from relatively complex component structures, long analysis cycles, high costs, and difficulties in maintenance and transportation, making them unsuitable for applications in drilling sites or other environments. Furthermore, with the increasing demand for fluorescence analysis technology of drilling fluids and their carried cuttings during drilling, no technology or equipment for continuous fluorescence detection of these drilling fluids and their carried cuttings has yet been found domestically or internationally. Currently, in actual drilling operations, fluorescence detection technology based on manual sampling and manual testing cannot achieve continuous automatic detection and analysis of fluorescence intensity, fluorescence area, or fluorescence image signals in drilling fluids. Moreover, the existing analytical techniques suffer from significant human error and poor effectiveness, making it difficult to effectively interpret and evaluate the oil-bearing properties of reservoirs under rapid drilling conditions. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic fluorescence detection device and application method for drilling fluid to solve the above-mentioned problems. To achieve the above objective, the technical solution adopted by this invention is as follows:

[0006] In a first aspect, this application provides an automatic drilling fluid fluorescence detection device, comprising: a sample pretreatment system for quantitatively collecting drilling fluid and cuttings, and grinding the cuttings therein; a lower chamber located on one side of the sample pretreatment system, the lower chamber being the main body of a sample cooling system, an upper chamber located above the lower chamber, a refrigerator located on the inner wall of the upper chamber, and the lower chamber and the refrigerator being connected via a cold air duct; the sample cooling system, consisting of the lower chamber and the refrigerator, is used to cool the drilling fluid and cuttings obtained by the sample pretreatment system; and a sample fluorescence detection system located inside the upper chamber, used to perform fluorescence detection analysis on the cooled sample.

[0007] Optionally, the sample pretreatment system includes: a filter hood, a drilling fluid pipeline, a clean water pipeline, a drilling fluid throttle valve, a clean water throttle valve, a metering diaphragm pump, and a cuttings grinder. The filter hood is disposed within the tank where the drilling fluid and cuttings are mixed; the filter hood is cylindrical and composed of a mesh-like wire mesh; one end of the drilling fluid pipeline is located within the cavity of the filter hood; one end of the clean water pipeline is connected to the drilling fluid pipeline; the clean water throttle valve is located on the clean water pipeline; and the drilling fluid throttle valve, the metering diaphragm pump, and the cuttings grinder are sequentially arranged on the drilling fluid pipeline.

[0008] Optionally, the rock cuttings grinder is used to grind the rock cuttings carried in the drilling fluid. The grinding shell of the rock cuttings grinder is equipped with grinding discs. The rock cuttings grinder can use grinding discs of different sizes to achieve different degrees of grinding of the rock cuttings.

[0009] Optionally, the sample cooling system includes: a cold air duct interface, a cooling pipeline inlet, a cooling pipeline, an exhaust port, a cooling pipeline outlet, a clamp, a refrigerator, and a cold air duct. The cold air duct interface is located on the lower housing. An exhaust port is provided on the side wall of the refrigerator. One end of the cold air duct is connected to the refrigerator through the exhaust port, and the other end of the cold air duct is connected to the lower housing through the cold air duct interface. The cooling pipeline inlet is located on the side of the lower housing. The cooling pipeline is located in the inner cavity of the lower housing and is connected to the drilling fluid pipeline through the cooling pipeline inlet. The cooling pipeline can be arranged in a spiral shape, and the cooling pipeline is fixedly connected to the lower housing through a clamp. The cooling pipeline is used to cool the drilling fluid and the ground rock cuttings. The exhaust port is located on the other side of the lower housing, and the cooling pipeline outlet is located on the top surface of the lower housing.

[0010] Optionally, the sample fluorescence detection system includes: an ultraviolet excitation component, a fluorescence reflection component, a sample cell, a detector, an A / D module, and a power control module. The sample cell is located at the bottom of the upper chamber, and a sample inlet is provided at the bottom of the sample cell. The cooling pipeline outlet is connected to the sample inlet. The sample inlet is used to input cooled drilling fluid and ground rock cuttings into the sample cell. The sample cell can be rectangular in shape. The ultraviolet excitation component is located on the two long sides of the sample cell. The fluorescence reflection component is located inside the upper chamber and along the short side of the sample cell. The detector is located above the fluorescence reflection component. The A / D module is located on the side of the upper chamber. The power control module is located on one side of the A / D module.

[0011] Optionally, the ultraviolet light excitation assembly includes: an ultraviolet light source, a collimating lens, a filter, and a first mounting frame. The long side of the sample cell corresponds to the first mounting frame, which is used to mount the ultraviolet light excitation assembly. The ultraviolet light source, collimating lens, and filter are sequentially arranged within the first mounting frame. The ultraviolet light source includes: a power board, transistors, and a light shield. The ultraviolet light source consists of multiple transistors evenly distributed on the power board. The light shield is located on the outside of the power board and is arc-shaped.

[0012] Optionally, the fluorescence reflection component includes: a reflector, a fluorescence filter, a condenser, and a second mounting bracket. The second mounting bracket is located near the short side of the sample cell inside the upper housing. The second mounting bracket is used to mount the fluorescence reflection component. The reflector, fluorescence filter, and condenser are sequentially arranged inside the second mounting bracket, and the reflector is opposite to the short side of the sample cell. The reflector is used to adjust the angle of the fluorescence light emitted by the sample in the sample cell.

[0013] Optionally, a detector is provided above the second mounting bracket. The detector is used for fluorescence signal amplification and corresponding signal value output. An A / D module is provided on the outer wall of the upper housing. The A / D module is used to convert the fluorescence analog electrical signal input by the detector into a data signal. A power control module is provided on one side of the A / D module. The power control module is used to provide different power supply voltages to each device. Further, the detector type can be a charge-coupled device array detector (CCD detector) to realize the output of fluorescence intensity signal and the coordinated acquisition of fluorescence image.

[0014] Secondly, this application also provides a method for applying an automatic drilling fluid fluorescence detection device, comprising the following steps:

[0015] S1: The drilling fluid pipeline is connected to the inlet of the cooling pipeline inside the lower tank, and the outlet of the cooling pipeline is connected to the inlet of the sample flow.

[0016] S2: Place the filter cover in the tank where drilling fluid and cuttings are mixed, close the clean water throttle valve, open the drilling fluid throttle valve, and start the power supply of the metering diaphragm pump, cuttings grinder, chiller, A / D module, and power control module;

[0017] S3: The sample is filtered through the filter cover, quantitatively extracted by the quantitative diaphragm pump, ground by the rock chip grinder, and flows into the cooling pipeline. At the same time, the cold air generated by the refrigerator is delivered to the lower chamber through the cold air pipe.

[0018] S4: The cooled sample is input into the sample cell through the sample inlet via the cooling pipeline. After the ultraviolet light emitted by the ultraviolet excitation component irradiates the sample in the sample cell, the sample is excited to emit fluorescence. The fluorescence is transmitted to the detector in real time through the fluorescence reflection component to form a fluorescence intensity signal, which is then converted into a digital signal by the A / D module.

[0019] Optionally, when drilling fluid, cuttings residue, or pipeline blockage exists in the drilling fluid line, cuttings grinder, cooling line, and sample tank, the procedure includes the following steps:

[0020] L1: Close the drilling fluid throttle valve and open the clean water throttle valve;

[0021] L2: Start the metering diaphragm pump, cuttings grinder, chiller, A / D module, and power control module to increase the flow rate of the metering diaphragm pump. Clean water flows through the drilling fluid pipeline, cuttings grinder, cooling pipeline, and sample cell to rinse the above components until no drilling fluid or cuttings are discharged from the sample drain outlet.

[0022] L3: Adjust the flow rate of the metering diaphragm pump to the normal operating flow rate, open the drilling fluid throttle valve, and close the clean water throttle valve;

[0023] L4: Perform sample testing and analysis according to steps S2 to S4 above.

[0024] Optionally, when the drilling fluid is too viscous or the sample fluorescence intensity is too high, the following steps are included:

[0025] N1: Open the drilling fluid throttle valve appropriately, open the clean water throttle valve appropriately, place the filter cover in the tank where the drilling fluid and cuttings are mixed, close the clean water throttle valve, open the drilling fluid throttle valve, and start the metering diaphragm pump, cuttings grinder, refrigerator, A / D module, and power control module to dilute the sample.

[0026] N2: Adjust the opening degree of the drilling fluid throttle valve and the clean water throttle valve until the fluorescence intensity signal value is within the normal inspection range;

[0027] N3: Perform sample testing and analysis according to steps S2 to S4 above.

[0028] The beneficial effects of this invention are:

[0029] 1. It achieves rock cuttings grinding under quantitative sample extraction conditions. At the same time, quantitative sample extraction ensures that there is always a sufficient amount of drilling fluid and rock cuttings of uniform size flowing through the sample pool. In addition, the flow rate of the quantitative diaphragm pump can be adjusted to achieve the flow of drilling fluid from high flow rate to low flow rate in the sample pool.

[0030] 2. The sample cooling system reduces the influence of sample temperature on the sample emission fluorescence intensity. At the same time, by adjusting the output power of the cooling fan according to different drilling fluid temperatures, it ensures that the drilling fluid temperature is always in a low-temperature and quasi-constant state.

[0031] 3. The matrix-type high-intensity LED ultraviolet light source symmetrically irradiates the sample cell, which enhances the intensity of fluorescence emitted by the sample in the sample cell. The design of the light shield not only ensures the excitation intensity of a single LED light source, but also reduces the interference of scattered ultraviolet light on the fluorescence detection of the sample. On the other hand, the ultraviolet light source emitted by the LED transistor is a cold light source, which reduces the influence of the light source temperature on the fluorescence intensity emitted by the sample.

[0032] 4. By extracting sufficient sample volume and measuring fluorescence signals in real time within the sample cell, continuous fluorescence detection and analysis of the sample are achieved, improving the effectiveness of sample analysis.

[0033] 5. The upper and lower housings of this equipment are detachably connected, which facilitates the replacement and maintenance of components such as the light source, sample cell, detector, and cooling pipeline. At the same time, the entire housing is designed as an explosion-proof structure with thermal insulation, which can be installed at the drilling site, enabling the application of this equipment in drilling sites or other environments. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the sample pretreatment system described in an embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram of the main structure of the sample cooling system according to an embodiment of the present invention.

[0037] Figure 3 This is a schematic diagram of the sample fluorescence detection system according to an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of the ultraviolet light source component structure according to an embodiment of the present invention.

[0039] Figure 5 This is a flowchart of an automatic fluorescence detection method for drilling fluid according to an embodiment of the present invention.

[0040] Figure 6 This is a flowchart of step L of an automatic detection method for drilling fluid fluorescence according to an embodiment of the present invention.

[0041] Figure 7 This is a flowchart of step N of an automatic detection method for drilling fluid fluorescence according to an embodiment of the present invention.

[0042] Labels in the diagram: 1-Sample pretreatment system, 11-Filter hood, 12-Drilling fluid pipeline, 13-Clean water pipeline, 14-Drilling fluid throttle valve, 15-Clean water throttle valve, 16-Quantitative diaphragm pump, 17-Cuttings grinder, 171-Grinding disc, 2-Lower chamber, 21-Cold air duct interface, 22-Cooling pipeline inlet, 23-Cooling pipeline, 24-Exhaust port, 25-Cooling pipeline outlet, 26-Clamping clamp, 3-Upper chamber, 4-Refrigerator, 5-Cold air duct, 6-Ultraviolet excitation component, 61-Ultraviolet light excitation component External light source, 611-Power board, 612-Transistor, 613-Light shield, 62-Collimating lens, 63-Filter, 64-First mounting bracket, 7-Fluorescence reflection assembly, 71-Reflector, 72-Fluorescence filter, 73-Condenser, 74-Second mounting bracket, 8-Sample outlet, 9-Sample drain line, 10-Sample drain port, 100-Sample cell, 101-Sample inlet, 111-Detector, 112-A / D module, 113-Power control module, 114-Fan. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0044] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0046] like Figures 1 to 4 As shown, in a first aspect, this patent application provides an automatic drilling fluid fluorescence detection device, comprising: a sample pretreatment system 1, which is used to quantitatively collect drilling fluid and cuttings, and to grind the cuttings therein; a lower chamber 2, which is located on one side of the sample pretreatment system 1 and serves as the main body of a sample cooling system, with an upper chamber 3 located on the upper part of the lower chamber 2, and a refrigerator 4 located on the inner wall of the upper chamber 3; the lower chamber 2 and the refrigerator 4 are connected by a cold air duct 5; the sample cooling system consists of the lower chamber 2 and the refrigerator 4, and is used to cool the drilling fluid and cuttings obtained by the sample pretreatment system 1; and a sample fluorescence detection system, which is located inside the upper chamber 3 and is used to perform fluorescence detection analysis on the cooled sample.

[0047] It should be noted that the sample pretreatment system 1 is connected to the tank for mixing drilling fluid and cuttings. Optionally, the sample pretreatment system 1 can also be connected to other hydrocarbon-containing water bodies. Thus, samples for testing can be continuously fed into the sample pretreatment system 1, achieving effective sample analysis. The lower chamber 2 is a flat cuboid shape, and the dimensions of the lower chamber 2 correspond to those of the upper chamber 3. The upper chamber 3 and the lower chamber 2 are detachably connected, which facilitates the replacement and maintenance of the internal components. At the same time, the entire chamber is an explosion-proof design with thermal insulation, which can be installed at the drilling site, enabling the application of this equipment at the drilling site or in other environments.

[0048] In this embodiment, the sample pretreatment system 1 includes: a filter hood 11, a drilling fluid pipeline 12, a clean water pipeline 13, a drilling fluid throttle valve 14, a clean water throttle valve 15, a metering diaphragm pump 16, and a cuttings grinder 17. The filter hood 11 is disposed in the tank where the drilling fluid and cuttings are mixed. The filter hood 11 is cylindrical and is composed of a mesh-like steel wire mesh. One end of the drilling fluid pipeline 12 is disposed in the inner cavity of the filter hood 11. One end of the clean water pipeline 13 is connected to the drilling fluid pipeline 12. The clean water throttle valve 15 is disposed on the clean water pipeline 13. The drilling fluid throttle valve 14, the metering diaphragm pump 16, and the cuttings grinder 17 are sequentially disposed on the drilling fluid pipeline 12.

[0049] The sample pretreatment system 1 enables the quantitative collection of drilling fluid and the rock cuttings it carries, as well as the grinding of the rock cuttings. The filter cover 11 is placed in the tank where the drilling fluid and rock cuttings are mixed to block large mudstone and sandstone lumps. The drilling fluid and the rock cuttings it carries are filtered through the filter cover 11 and enter the drilling fluid pipeline 12. The quantitative diaphragm pump 16 transports the drilling fluid and the rock cuttings it carries to the rock cuttings grinder 17.

[0050] Among them, the rock cuttings grinder 17 in the sample pretreatment system 1 is used to grind the rock cuttings carried in the drilling fluid. The grinding shell of the rock cuttings grinder 17 is equipped with grinding discs 171. The rock cuttings grinder 17 can use grinding discs 171 of different sizes to achieve different degrees of grinding of the rock cuttings.

[0051] It should be noted that the filter cover 11 is welded from a mesh of steel wire. The metering diaphragm pump 16 can be selected as a motor-driven mode. The metering diaphragm pump 16 has different flow rate adjustment functions. Therefore, according to the properties of the drilling fluid and the rock cuttings it carries, the flow rate of the metering diaphragm pump 16 can be adjusted to achieve the selection between high and low flow rates of the drilling fluid. The rock cuttings grinder 17 is designed to grind large pieces of rock cuttings in the drilling fluid, prevent large pieces of rock cuttings from blocking the pipeline, and at the same time ensure the uniform distribution of rock cuttings particles in the drilling fluid.

[0052] In this embodiment, the sample cooling system includes: a cold air duct interface 21, a cooling pipeline inlet 22, a cooling pipeline 23, an exhaust port 24, a cooling pipeline outlet 25, a clamp 26, a refrigerator 4, and a cold air duct 5. The cold air duct interface 21 is located on the lower housing 2. The refrigerator 4 has an exhaust port on its side wall. One end of the cold air duct 5 is connected to the refrigerator 4 through the exhaust port, and the other end of the cold air duct 5 is connected to the lower housing 2 through the cold air duct interface 21. The cooling pipeline inlet 22... The cooling pipeline 23 is located on the side of the lower housing 2 and is located inside the lower housing 2. The cooling pipeline 23 is connected to the other end of the drilling fluid pipeline 12 through the cooling pipeline inlet 22. The cooling pipeline 23 can be spirally distributed and is fixedly connected to the lower housing 2 by clamps 26. The cooling pipeline 23 is used to cool the sample. The exhaust port 24 is located on the other side of the lower housing 2 and the cooling pipeline outlet 25 is located on the top surface of the lower housing 2.

[0053] Drilling fluid and rock cuttings ground by the cuttings grinder 17 flow through drilling fluid pipeline 12 and into cooling pipeline 23 via cooling pipeline inlet 22. At this time, cold air generated by the refrigerator 4 is delivered to the lower chamber 2 through cold air duct 5 and then discharged through exhaust port 24. Under the combined action of the refrigerator 4 and cooling pipeline 23, the cooling pipeline 23 cools the sample. The design of the sample cooling system reduces the influence of sample temperature on sample fluorescence intensity. At the same time, according to the different sample temperature settings, the output power of the refrigerator 4 is adjusted to ensure that the sample temperature is always at a low temperature and quasi-constant temperature. The cooling pipeline 23 can be made of a thin-layer thermally conductive transparent material.

[0054] In this embodiment, the sample fluorescence detection system includes: an ultraviolet excitation component 6, a fluorescence reflection component 7, a sample cell 100, a detector 111, an A / D module 112, and a power control module 113. The sample cell 100 is located at the bottom of the inner cavity of the upper housing 3. The bottom of the sample cell 100 is provided with a sample inlet 101. The cooling pipeline outlet 25 is connected to the sample inlet 101. The sample inlet 101 is used to transport the cooled sample into the sample cell 100. The sample cell 100 can be selected as a cuboid shape. The ultraviolet excitation component 6 is located on the two long sides of the sample cell 100. The fluorescence reflection component 7 is located inside the upper housing 3 and on the short side of the sample cell 100. The detector 111 is located above the fluorescence reflection component 7. The A / D module 112 is located on the side of the upper housing 3. The power control module 113 is located on one side of the A / D module 112.

[0055] The cooling pipeline outlet 25 is connected to the sample inlet 101. The cooled sample is input into the sample cell 100 through the cooling pipeline outlet 25 and the sample inlet 101. The ultraviolet excitation component 6 generates ultraviolet light of sufficient intensity and specific wavelength. Under ultraviolet light irradiation, the hydrocarbon components in the sample emit fluorescence. The fluorescence reflection component 7 can adjust the angle of the fluorescence light. The detector 111 can be a photomultiplier tube for amplifying the fluorescence signal and outputting the corresponding fluorescence signal. The detector 111 is externally attached to the top surface of the upper housing 3. Type 111 can also be a charge-coupled device array detector (CCD detector) to realize the coordinated acquisition of fluorescence intensity signal output and fluorescence image. The power control module 113 is used to provide different power supply voltages to the ultraviolet light source 61, the refrigerator 4, the detector 111, the fan 114, and the A / D module 112. The A / D module 112 is used to convert the fluorescence analog electrical signal in the detector 111 into a digital signal and provide a universal digital signal output interface. The fan 114 is embedded in the inner wall of the upper housing 3 and close to the detector 111 for ventilation inside the upper housing 3.

[0056] It should be noted that the sample cell 100 can be made of quartz and can also be rectangular in shape. The two long sides of the sample cell 100 correspond to the ultraviolet light excitation component 6, and the short side of the sample cell 100 corresponds to the fluorescence reflection component 7. The top of the sample cell 100 is provided with a sample outlet 8, which is connected to the sample drainage line 9. The sample flowing out of the sample cell 100 is discharged from the sample drainage port 10 through the sample drainage line 9. The sample cell 100 is designed to be detachable for easy daily cleaning and maintenance.

[0057] To further explain, the fluorescence intensity signal value of the sample when there is no oil and gas indication can be used as the background value for the current reservoir oil and gas fluorescence indication. By comparing and analyzing the background fluorescence intensity value with the current reservoir fluorescence intensity value, the oil-bearing nature of the reservoir can be interpreted.

[0058] In this embodiment, the ultraviolet light excitation assembly 6 includes: an ultraviolet light source 61, a collimating lens 62, a filter 63, and a first mounting frame 64. The sample cell 100 is located on the side of the first mounting frame 64, which is used to mount the ultraviolet light excitation assembly 6. The ultraviolet light source 61, the collimating lens 62, and the filter 63 are sequentially arranged within the first mounting frame 64. The ultraviolet light source 61 includes: a power board 611, transistors 612, and a light shield 613. The ultraviolet light source 61 consists of multiple transistors 612 evenly distributed on the power board 611. The light shield 613 is located outside the power board 611 and is arc-shaped.

[0059] The excitation source is a high-intensity matrix LED ultraviolet light source, and the ultraviolet light is emitted by LED transistors 612. Transistors 612 can be selected from 24 groups of transistors or 32 groups of transistors. A light shield 613 is provided outside the power board 611. The light shield 613 can ensure the excitation intensity of a single LED light source and reduce the interference of scattered ultraviolet light on the fluorescence detection of the sample. The ultraviolet light excitation component 6 is designed as two symmetrical groups, which emit stable and high-intensity ultraviolet light from the left and right directions respectively, enhancing the intensity of fluorescence emitted by the sample in the sample cell 100. At the same time, the ultraviolet light emitted by the transistors 612 is a cold light source, which can reduce the influence of the light source temperature on the fluorescence intensity emitted by the sample.

[0060] In this embodiment, the fluorescence reflection component 7 includes: a reflector 71, a fluorescence filter 72, a condenser lens 73, and a second mounting bracket 74. The second mounting bracket 74 is located near the short side of the sample cell 100 along the upper housing 3. The second mounting bracket 74 is used to mount the fluorescence reflection component 7. The reflector 71, the fluorescence filter 72, and the condenser lens 73 are sequentially arranged in the second mounting bracket 74, and the reflector 71 is opposite to the short side of the sample cell 100.

[0061] The reflector 71 is used to adjust the angle of the fluorescent light emitted by the sample in the sample cell 100, the filter 72 is used to filter out scattered light other than fluorescence, and the focusing lens 73 is used to focus the fluorescence and enhance the fluorescence intensity.

[0062] like Figures 5 to 7 As shown, in a second aspect, based on the aforementioned drilling fluid fluorescence automatic detection device, this patent application provides a drilling fluid fluorescence automatic detection method, which includes:

[0063] S1: Drilling fluid line 12 is connected to cooling line inlet 22 inside lower box 2, and cooling line outlet 25 is connected to sample flow inlet 101;

[0064] S2: Place the filter cover 11 in the tank where drilling fluid and cuttings are mixed, close the clean water throttle valve 15, open the drilling fluid throttle valve 14, and start the metering diaphragm pump 16, cuttings grinder 17, chiller 4, A / D module 112, and power control module 113.

[0065] S3: The sample is filtered through the filter cover 11, quantitatively extracted by the quantitative diaphragm pump 16, ground by the rock chip grinder 17, and flows into the cooling pipeline 23. At the same time, the cold air generated by the refrigerator 4 is delivered to the lower chamber 2 through the cold air pipe 5.

[0066] S4: The cooled sample is input into the sample cell 100 through the sample inlet 101 via the cooling line 23. After the ultraviolet light emitted by the ultraviolet light excitation component 6 irradiates the sample in the sample cell 100, the sample is excited to emit fluorescence. The fluorescence is transmitted to the detector 111 in real time via the fluorescence reflection component 7 to form a fluorescence intensity signal, which is then converted into a numerical signal by the A / D module 112.

[0067] In this embodiment, optionally, when there is drilling fluid, cuttings residue, or pipeline blockage in the drilling fluid pipeline, cuttings grinder, cooling pipeline, or sample tank, the following steps are included:

[0068] L1: Close drilling fluid throttle valve 14, open clean water throttle valve 15;

[0069] L2: Start the metering diaphragm pump 16, rock cuttings grinder 17, refrigerator 4, A / D module 112, and power control module 113 to increase the flow rate of the metering diaphragm pump 16. Clean water flows through the drilling fluid pipeline 12, rock cuttings grinder 17, cooling pipeline 23, and sample pool 100 to rinse the above components until no drilling fluid or rock cuttings are discharged from the sample drain outlet 10.

[0070] L3: Adjust the flow rate of metering diaphragm pump 16 to the normal operating flow rate, open drilling fluid throttle valve 14, and close clean water throttle valve 15;

[0071] L4: Perform sample testing and analysis according to steps S2 to S4 above.

[0072] In this embodiment, optionally, when the drilling fluid is too viscous or the fluorescence intensity of the sample is too high, the following steps are included:

[0073] N1: Open the drilling fluid throttle valve 14 and the clean water throttle valve 15 appropriately. Place the filter cover 11 in the tank where the drilling fluid and cuttings are mixed. Close the clean water throttle valve 15 and open the drilling fluid throttle valve 14. Start the metering diaphragm pump 16, the cuttings grinder 17, the refrigerator 4, the A / D module 112, and the power control module 113 to dilute the sample.

[0074] N2: Adjust the opening degree of drilling fluid throttle valve 14 and clean water throttle valve 15 until the fluorescence intensity signal value is within the normal inspection range;

[0075] N3: Perform sample testing and analysis according to steps S2 to S4 above.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. However, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An automatic fluorescence detection device for drilling fluid, characterized in that, include: Sample pretreatment system (1), the sample pretreatment system (1) is used to quantitatively collect drilling fluid and rock cuttings, and grind the rock cuttings therein; The lower box (2) is provided with an upper box (3) at the top. The upper box (3) is provided with a refrigeration unit (4) on its inner side wall. The lower box (2) and the refrigeration unit (4) are connected by a cold air duct (5). The sample cooling system consists of a lower chamber (2) and a refrigerator (4). The sample cooling system is used to cool the drilling fluid and cuttings obtained by the sample pretreatment system (1). A sample fluorescence detection system is located inside the upper housing (3). The sample fluorescence detection system is used to perform fluorescence detection analysis on samples that have been processed by the sample cooling system. The sample pretreatment system (1) includes: a filter cover (11), a drilling fluid pipeline (12), a clean water pipeline (13), a drilling fluid throttle valve (14), a clean water throttle valve (15), a metering diaphragm pump (16), and a cuttings grinder (17). The filter cover (11) is located in the tank where the drilling fluid and cuttings are mixed. The filter cover (11) is cylindrical and made of wire mesh. One end of the drilling fluid pipeline (12) is located in the inner cavity of the filter cover (11). One end of the clean water pipeline (13) is connected to the drilling fluid pipeline (12). The clean water throttle valve (15) is located on the clean water pipeline (13). The drilling fluid throttle valve (14), the metering diaphragm pump (16), and the cuttings grinder (17) are sequentially located on the drilling fluid pipeline (12).

2. The drilling fluid fluorescence automatic detection device according to claim 1, characterized in that, The rock cuttings grinder (17) is used to grind the rock cuttings carried in the drilling fluid. The grinding shell of the rock cuttings grinder (17) is equipped with grinding discs (171). The rock cuttings grinder (17) can use grinding discs (171) of different sizes to achieve different degrees of grinding of the rock cuttings.

3. The drilling fluid fluorescence automatic detection device according to claim 1, characterized in that, The lower housing (2) includes: a cold air duct interface (21), a cooling line inlet (22), a cooling line (23), an exhaust port (24), a cooling line outlet (25), and a clamp (26). The cold air duct interface (21) is located on the lower housing (2). The refrigerator (4) has an exhaust port. One end of the cold air duct (5) is connected to the refrigerator (4) through the exhaust port, and the other end of the cold air duct (5) is connected to the lower housing (2) through the cold air duct interface (21). The cooling pipeline inlet (22) is located on the side of the lower housing (2), the cooling pipeline (23) is located in the inner cavity of the lower housing (2), and the cooling pipeline (23) is connected to the drilling fluid pipeline (12) through the cooling pipeline inlet (22). The cooling pipeline (23) is fixedly connected to the lower housing (2) by a clamp (26). The exhaust port (24) is located on the side of the lower housing (2), and the cooling pipeline outlet (25) is located on the top surface of the lower housing (2).

4. The drilling fluid fluorescence automatic detection device according to claim 3, characterized in that, The sample fluorescence detection system includes: an ultraviolet light excitation component (6), a fluorescence reflection component (7), a sample cell (100), a detector (111), an A / D module (112), and a power control module (113). The sample cell (100) is located at the bottom of the inner cavity of the upper housing (3). The bottom of the sample cell (100) is provided with a sample inlet (101). The cooling pipeline outlet (25) is connected to the sample inlet (101). The ultraviolet light excitation component (6) is located inside the upper housing (3) and on both sides of the sample cell (100). The fluorescence reflection component (7) is located inside the upper housing (3) and on the other side of the sample cell (100). The detector (111) is located above the fluorescence reflection component (7).

5. The drilling fluid fluorescence automatic detection device according to claim 4, characterized in that, The ultraviolet light excitation assembly (6) includes: an ultraviolet light source (61), a collimating lens (62), a filter (63), and a first mounting bracket (64). The first mounting bracket (64) is used to mount the ultraviolet light excitation assembly (6). The ultraviolet light source (61), the collimating lens (62), and the filter (63) are sequentially disposed in the first mounting bracket (64). The ultraviolet light source (61) includes: a power board (611), a transistor (612), and a light shield (613). The ultraviolet light source (61) consists of multiple transistors (612) distributed on the power board (611), and the light shield (613) is disposed on the outside of the power board (611).

6. The drilling fluid fluorescence automatic detection device according to claim 4, characterized in that, The fluorescence reflection component (7) includes: a reflector (71), a fluorescence filter (72), a condenser (73), and a second mounting bracket (74). The second mounting bracket (74) is located inside the upper housing (3) and is used to install the fluorescence reflection component (7). The reflector (71), the fluorescence filter (72), and the condenser (73) are sequentially arranged inside the second mounting bracket (74), and the reflector (71) is opposite to the side of the sample cell (100). The reflector (71) is used to adjust the angle of the fluorescence light emitted by the sample in the sample cell (100).

7. A method for applying an automatic drilling fluid fluorescence detection device, applicable to the automatic drilling fluid fluorescence detection device according to any one of claims 1-6, characterized in that, The application method includes the following steps: S1: Connect the drilling fluid line (12) to the cooling line inlet (22) inside the lower box (2), and connect the cooling line outlet (25) to the sample flow inlet (101); S2: Place the filter cover (11) in the tank where drilling fluid and cuttings are mixed, close the water throttle valve (15), open the drilling fluid throttle valve (14), and start the metering diaphragm pump (16), cuttings grinder (17), chiller (4), A / D module (112), and power control module (113). S3: The sample is filtered through the filter cover (11), quantitatively extracted by the quantitative diaphragm pump (16), ground by the rock chip grinder (17), and flows into the cooling pipeline (23). At the same time, the cold air generated by the refrigerator (4) is delivered to the lower box (2) through the cold air pipe (5). S4: The cooled sample is input into the sample cell (100) through the cooling pipeline (23) and the sample inlet (101). After the ultraviolet light emitted by the ultraviolet light excitation component (6) irradiates the sample in the sample cell (100), the sample excites fluorescence. The fluorescence is transmitted to the detector (111) in real time through the fluorescence reflection component (7) to form a fluorescence intensity signal, which is then converted into a digital signal by the A / D module (112).

8. The application method of the drilling fluid fluorescence automatic detection device according to claim 7, characterized in that, When drilling fluid, cuttings residue, or pipeline blockage occurs in the drilling fluid line (12), cuttings grinder (17), cooling line (23), and sample tank (100), the procedure includes: L1: Close the drilling fluid throttle valve (14), open the clean water throttle valve (15). L2: Start the metering diaphragm pump (16), rock cuttings grinder (17), refrigerator (4), A / D module (112), and power control module (113) to increase the flow rate of the metering diaphragm pump (16). Clean water flows through the drilling fluid pipeline (12), rock cuttings grinder (17), cooling pipeline (23), and sample pool (100) to rinse the above components until no drilling fluid or rock cuttings are discharged from the sample drain outlet (10). L3: Adjust the flow rate of the metering diaphragm pump (16) to the normal working flow rate, open the drilling fluid throttle valve (14), and close the clean water throttle valve (15). L4: Perform sample testing and analysis according to steps S2 to S4 above.

9. The application method of the drilling fluid fluorescence automatic detection device according to claim 7, characterized in that, When the drilling fluid is too thick or the fluorescence intensity of the sample is too high, the following steps are included: N1: Open the drilling fluid throttle valve (14) and the clean water throttle valve (15) appropriately. Place the filter cover (11) in the tank where the drilling fluid and cuttings are mixed. Close the clean water throttle valve (15), open the drilling fluid throttle valve (14), and start the quantitative diaphragm pump (16), cuttings grinder (17), refrigerator (4), A / D module (112), and power control module (113) to dilute the sample. N2: Adjust the opening degree of drilling fluid throttle valve (14) and clean water throttle valve (15) until the fluorescence intensity signal value is within the normal inspection range; N3: Perform sample testing and analysis according to steps S2 to S4 above.

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